Theory of spin center sensing of diffusion and other surface electric dynamics
Year: 2024
Type: article
Abstract: Surface electric dynamics influences the quantum coherence of near-surface spin centers (i.e., T 1 and T 2 times) through spatial and temporal fluctuations of the surface charge density and the electrostatic potential at the crystal surface that are described by the spectral noise density S ( ω ) . We find that the electric noise's S ( ω ) dependence on the depth d of a spin center below the surface follows a power law d − γ not solely determined by whether the surface charges move as localized pointlike charges (monopoles) or dipoles. The exponent γ instead reveals the structure of the surface charge and surface potential correlation functions. For surface dynamics originating from diffusion, the spin center's relaxation and decoherence times exhibit a temporal crossover near the correlation time of the fluctuators and thus provide a quantitative fingerprint of the diffusive behavior of charged particles at surfaces. Published by the American Physical Society 2024
Authors: Denis R. Candido, Michael E. Flatté
Institutions: University of Iowa, Eindhoven University of Technology
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4404757774